<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
</head>
   <div class="dropzone">
       <div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData('text/plain',null)">
           This div is draggable
       </div>
   </div>
   <div class="dropzone"></div>
   <div class="dropzone"></div>
   <div class="dropzone"></div>

   <style>
     #draggable {
       width: 200px;
       height: 20px;
       text-align: center;
       background: white;
     }

     .dropzone {
       width: 200px;
       height: 20px;
       background: blueviolet;
       margin-bottom: 10px;
       padding: 10px;
     }
   </style>

   <script>
     var dragged;

     /* events fired on the draggable target */
     document.addEventListener("drag", function( event ) {

     }, false);

     document.addEventListener("dragstart", function( event ) {
        event.dataTransfer.effectAllowed  = 'nonmove';
         // store a ref. on the dragged elem
         dragged = event.target;
         // make it half transparent
         event.target.style.opacity = .5;

     }, false);

     document.addEventListener("dragend", function( event ) {
         // reset the transparency
         event.target.style.opacity = "";

     }, false);

     document.addEventListener("dragexit", function( event ) {
         // reset the transparency
         event.target.style.opacity = "";
         console.log(event.target);

     }, false);

     /* events fired on the drop targets */
     document.addEventListener("dragover", function( event ) {
         // prevent default to allow drop
         event.preventDefault();

     }, false);

     document.addEventListener("dragenter", function( event ) {
         // highlight potential drop target when the draggable element enters it
         if ( event.target.className == "dropzone" ) {
             event.target.style.background = "#fff";
         }
     }, false);

     document.addEventListener("dragleave", function( event ) {
         // reset background of potential drop target when the draggable element leaves it
         if ( event.target.className == "dropzone" ) {
             event.target.style.background = "blue";
         }

     }, false);

     document.addEventListener("drop", function( event ) {
         // prevent default action (open as link for some elements)
         event.preventDefault();
         // move dragged elem to the selected drop target
         if ( event.target.className == "dropzone" ) {
             event.target.style.background = "yellow";
             dragged.parentNode.removeChild( dragged );
             event.target.appendChild( dragged );
         }
     }, false);
   </script>
    </body>
</html>